Bose Personalized Amplification System, Troubleshooting Manual

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1.2.3 LED Trigger Level
The system has also two signal/clip LED indicators. The signal LED should turn on as soon as
the level reaches -30 dB versus nominal level and the clip LED should light at +6 dB versus
nominal level.
Table 3. LED Trigger Levels
1.3 Auto-detection, Operational Modes and Debug Mode
1.3.1 Rational and Operational Modes
The system can be set up in a variety of different bass configurations. There is some concern,
for example, that a system consisting of a power stand, 2 line arrays and 2 bass modules may
not produce enough bass output for (e.g.) bass players or a kick drum. To this end we have
provided the “Bass Send” output on the power stand that can be connected to the “All Amps In”
input of a second power stand. That second power stand does NOT have any line arrays con-
nected but can drive between 1 and 6 additional bass modules. Figures 7-10 show typical
configurations.
Figure 7. Nominal Bass Configuration, 2 Bass Modules
THEORY OF OPERATION
Nominal
Control Signal Clip Comment
Input
LED
-30 dBV +6 dBV At Mic/Line PreAmp Output. All levels unbalanced (at internal
measurement points)
Remote
LED -40 dBV -4 dBV At A/D input. This corresponds to -46 dBFS and -10 dBFS
respectively. There is 10 dB headroom between the clip
indicator coming on and the point where the A/D would
actually clip